Study of arrayed side branch silencer for ventilation door (Theoretical analysis and measurement of transmission loss)
Study of arrayed side branch silencer for ventilation door (Theoretical analysis and measurement of transmission loss)
复制标题
通风门阵列式侧支消声器研究（理论分析及传输损失测量）
DOI：
10.1299/jamdsm.2015jamdsm0028
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Toshio Katou
中科院分区：
文献类型：
--
作者：
S. Sakamoto;Seiya Tatsuza;M. Ishida;Arata Nakano;Kuniaki Nagai;Toshio Katou
本研究的重点是在室内使用的门定位在一个阵列的消声器。本文讨论了在风门内设置侧分支消声器的研究。通过设计和制造一个特殊的附件，我们能够将消声器连接到具有比阻抗测量管更大横截面的测量管上。使用该附件，我们测量了六个不同的原型消声器的声学传输损失。通过添加孔板消声器的效果，我们得到了在很宽的频率范围内的传输损耗。然而，在低于侧分支管的衰减峰值的频率范围内衰减减小。侧分支管的楔形纵向横截面可以使消音器的长度加倍，并在保持相同体积的同时产生低频衰减效果。这种楔形侧分支管适用于以阵列形式并排放置的长消音器。基于一维波动方程，采用传递矩阵法对消声器的声传递损失进行了理论分析。对具有楔形纵截面侧分支管的消声器的传递矩阵进行了单元分解。我们得到的计算结果与我们的实验测量相比是足够有效的。
This study focuses on acoustic silencers on indoor-use doors positioned in an array. In this paper, we discuss our studies of side branch silencers which are built in the ventilation door. By designing and fabricating a special attachment, we were able to attach silencers to the measurement tube that had larger cross sections than the impedance measurement tube. Using this attachment, we measured acoustic transmission losses for each of six different prototype silencers. By adding orifice silencer effects, we obtained transmission losses across a wide frequency range. However, attenuation decreased in frequency ranges below the attenuation peak of the side branch tubes. A wedge-shaped longitudinal cross section for the side branch tubes can double the length of the silencer and develop lower-frequency attenuation effects, while maintaining the same volume. This wedge-shaped side branch tube is suitable for a long silencer placed side by side in an array formation. We performed theoretical analyses of acoustic transmission losses of silencers using the transfer matrix method based on a one-dimensional wave equation. We performed element decomposition on the transfer matrix for silencers with side branch tubes with a wedge-shaped longitudinal cross section. We obtained calculated results that were sufficiently valid compared to our experimental measurements.